/* ============================================================
DiveLog DS — Layout: Application Shell
v3.3 (2026-07-23): DDR-006 — rimozione topbar globale.
Grid: sidebar + main su un'unica riga (1fr).
Mobile: mobile trigger (logo floating) + drawer overlay.
Desktop: sidebar permanente con rail mode.
============================================================ */
.app-shell {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
  min-height: 100vh;
  min-height: 100dvh;
  background: transparent;
  overflow: hidden;
}

.app-shell .splash-bg--app {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.app-shell .bubbles--app {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

/* Header DEPRECATED (DDR-006) — nascosto permanentemente */
.app-shell__header {
  display: none;
}

.app-shell__sidebar {
  grid-column: 1;
  grid-row: 1;
  z-index: 2;
}

.app-shell__main {
  position: relative;
  z-index: 2;
  grid-column: 1 / -1;
  grid-row: 1;
  overflow-y: auto;
  padding: var(--space-4);
  background: var(--surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--surface-glass-border);
  border-left: 1px solid var(--surface-glass-border);
  border-top-left-radius: var(--radius-large);
}

.page-container {
  position: relative;
  z-index: 3;
  max-width: var(--content-max-width);
  margin: 0 auto;
  width: 100%;
  padding: var(--space-4) 0;
}

@media (min-width: 600px) {
  .app-shell {
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: 1fr;
    transition: grid-template-columns var(--motion-medium) var(--ease-standard);
  }

  .app-shell--sidebar-collapsed {
    grid-template-columns: var(--sidebar-collapsed-width) 1fr;
  }

  .app-shell__sidebar {
    grid-column: 1;
    grid-row: 1;
  }

  .app-shell__main {
    grid-column: 2;
    grid-row: 1;
    padding: var(--space-6);
    border-top: none;
    border-top-left-radius: 0;
  }

  .page-container {
    padding: var(--space-6) 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .app-shell,
  .app-shell__main {
    transition: none;
  }
}